Annealing-furnace



L. WOLFFGRAM. ANNEALING FURNACE.

APPLICATION FILED MAY 24. l9l8.

1 ,329,873 Patented Feb. 3, 1920 INVENTOfl W v *???14- M ATTORNEY shapeof the annealing chamber. ierior of said chamber is adapted to receiveUNITED STATES PA ENT OFFICE.

LUnwIe woLrrenAM, or ERIE, PENNSYLVANIA.

mmms runmscn.

T 0 all whom it may concern:

Be it known that I, Ltmwie \Vonrienanr,

fication.

The objeetof my inventionis to provide improvements in annealingfurnaces for the purposechiefly of insuring a proper'heatmg of thefurnace, and preventing excessive wear thereof, and particularlybreakages such-as occur frequently-with annealing furnaces of theconstructions now employed, One of the features of my invention residesin the possibility of employing ordinary tirebriek in the constructionof 'the furnace, so that. the structure is relatively strong and muchless liable to break- -age, crackingand other accidents than theexisting furnaces of this class.

A typical example of an annealing fur.-

nace containing my improvements is repre-' sented 111 the accompanyingdrawings, in

which,

Figure 1 is at the left hand portion a longitudinal section of theimproved furnace,

taken on line 11 of Fig. 3, and at the.

right hand portion an elevation thereof; and

Figs. 2 and 3 are cross sections taken on lines and 33 respectively-ofFig. 1.

1 designates the centrally located retort or annealing chamber, which asshown is a long horizontal chamber or channel of substantiallyrectangular cross section, with preferably an arched roof, although I donot wish to restrict myself to this particular The inerably adjacent tothe bottom of the annealing chamber, 1 provide a number of outlets 3which lead intovertical channels 4, the lower ends of which communicateSpecification of Letters Patent.

Patented Feb. 3, 1920.

Application filed'llay 2451918 Serial No. 236.291.

withhorizontal channels 5 extendingtransversely under the bottom or soleof the annealing chamber 1. The transverse'channels 5 communicate-attheir discharge ends withlongitudinalchannels 6 which, extend adjacentto the bottoinwallof the annealing chamber, and under the-channels 1.There are twoalining channels 6 which extend from the 'ends of; thefurnace to the central portionthereof, the-innerrnds of said channelsbeing separated'by the brick work 6 of the stack connection 7, whichlatte-r" at its lower eud'colmnunicates with a longitudinal channel '8extending the full "of the channels 6,,a-nd communicating with theopposite ends of the latter by means of vertical connecting channels 9(see Fig. 1).

Above the roof of the annealing chamber is located a combustion chamberor heating chamber 10 connected'with the upper ends of the verticalchannels 4, and also con- -nected"with transverse channels or lines 11extending ou'twa gdly and connected with flaring mixing tubes 12 similarto the tubes '1". The channels 11 flare in the same manner as thechannels'l. fuel oil burner 13 is located adjacent to each of the mixingtubes 1:2, and such burnersare provided with controllin valves 13. Theparts 11,42 and 13 may be arranged directly above the correspondingparts 1',

, 1' and 2, or out ofvertieal alinement'therelength of the furnace, ata-level below that A gas burner orstance, by doors 14 suspended fromchains 14, and movableup and down in any wellknown manner. The mixingtubes 1" and 12 may be provided with sliding dampers 1" and 12respectively or with other shutoff devices, but I have found thatin'practice such shut-off devices are not essential, and they may beomitted.

Before bringing, the gom'ls to be annealed into the chamber 1, I heatthe latter interiorly with a direct flame, by opening the valves 2' andthus burning a mixture of fuel and air iirsaid chamber preferably untilthe 'latter is \vhitehot, that to say, bringing it to a highertemperature than the one obtained subsequently by the indirect orexternal heating of the annealing chamber. It will be understood thatduring this preheating, the doors 1 4 are closed.' The combustion gasespass out from the chamber 1 through the ehannels3, 4, 5, 6, 9, 8 and-7,

the annealin to the "stack: and heat. the interior of e tort, and alsoits bottom from below. Aft

chamber proper has thus been brought to w' its heat, t e burners, 2'areshut off by closing their.valves 2', the 'doors 14:

are opened, the material to be; annealed is introduced, the doors. '14are closed again,

and the burners 13 are set in operation to produce combustion of fuelinthe lipperor the channel '7 and pass to the-stack. It will? be seen thatthe combustion gases'journey'. p'actically all around theannealing-chamr, and therefore keep itheated in apnetically uniformmanner on all sides. -It will: also be noted that the combustion gasesare channels 5, and thereu roofv chamber 10.- The combustion verticalchannels-4 alon .one of theside walls of the annealing c iamber' andthen pass under the annealingchambe n lengthwise of the furnace '-in thechanne s ,6, to finally'rise" in caused tojourneytoward the ends of thefurnaceas shown best in Fig. 1, and inasmuch as these ends are the partswhich are cooled most strongly at-the time the/doors 14s are opened,theimpo'rtance of counteracting this cooling will be understood. Y

While I haveillustrated a preferred and. satisfactory form of myinvention, it is ob-.'

vious that changes may be-made therein within the spirit and scopethereof, as de- 1 fined in the appended claims.

l. A furnace provided with it main chamber, a heating chamber extendingover said main chamber and having spaced ports opening through one sideof the furnace for the admission .of adirect heating agent,saidmain-chamber also having spaced ports opening through the sidewallof the furnace for the admission of an independently controllableheating agent, said furnace havin :1 central stack connection, and means'of combustion from both of said for causing a retarded flow of the)roducts chambers beneath the main chamber to said stack co'nnection- 2.An annealing furnace provided with amainchamber, an external chamberabove the roof of said .main chamber. channels ex tending downwardlyfrom said roof chain- -ber adJacen't to one side of said maincluunbe!.and commuricatiug with the latter, channels extending transverselyunder the bottom of the main chamber-and communb cating with the lowerends of said downward channels, channels communicating gases from thisroof chamber flow down in ther in the with aid transverse channels asextending lengthwisetoward the ends of the mainhlntmberyaw'stack-connection at the central part bf thefurnacefandlongitudinal cha'nnels leading to said stack connection from theopposite-ends of the first-named longi-* tudinal -channels. T

.3. A furnace rovided with a main cham-i berfhaving ac osed roof, va.heating chain vbertindependent ofsaid main chamber, ex

tendingi-over the roof thereof and having? Spaced portsopening throughone side of the furnace for the; admission of a direct heating-agent, astack. connection liar the furand se arate means of communicationfromeach 0 said chambers to said flues,said Cl!"- cu itous. fines: beingoperative to retard the of combustion of the vflow of the productsstackconnection.

4. "A furnace 'rovided with a main chamber, anex'terna chamber abovetheroof'of said main chamber, channels extending downwardly from saidroof chamber ad acentto one side of the main chamber, a stack Aconnection adjacent to the other side of said nace,'and circuitousoutlet lines in the furnace walls leading to said stack connectlon,

'chamber, superposed longitudinal channels one of whiclrcommunicateswith the stack connection while the others connnunicate with thefirst-named longitudinalchannel at opposite .ends thereof, andtransverse chan;

nels extending under the bottomof the main "longitudinal channels withsaid downward chamber, superposed longitudinal channels,

thestac'k connection at, the central pottion of the furnace and with theupper-longitudinal channels at the ends of t e furnace, and transversechannels extending under the bottom of the main chamber-and con-"necting said downward channelswith the upper longitudinal channels.

In testimony that I claim the foregoing as my invention I have signed myname in presence of two subscribing witnesses.

. LITDWIG WOLFFGRAM. Witnesses: C., Zisssrznnnr, I JOHN B. EICHENLAUB.

- the lower one of which communicates with,

